Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020	Dec. 31, 2018
Accounting Policies [Line Items]
Long-term receivables	$ 20,041,000	$ 19,603,000
Interest income from long-term receivables	743,000	748,000	$ 990,000
Cumulative effect on retained earnings	$ 478,299,000	444,473,000	393,827,000		$ 371,753,000
Assets and Liabilities, Lessee [Abstract]
Percentage of tax benefits payable to partners under tax receivable agreement	85.00%
Remaining percentage of cash savings realized by the Company (as a percent)	15.00%
Revenue and Expense Recognition and Equity-Based Compensation
Minimum age of retiring employees required so that certain qualifying awards granted during employment will not be forfeited	56 years
Consecutive years of service of retiring employees required so that certain qualifying awards granted during employment will not be forfeited	5 years
Minimum total age and consecutive years of service of retiring employees required so that certain qualifying awards granted during employment will not be forfeited	65 years
Income Taxes
Unrecognized tax benefits	$ 0	0	0
Income tax related interest and penalties	0	0	0
Retained Earnings
Accounting Policies [Line Items]
Cumulative effect on retained earnings	$ (535,282,000)	$ (420,682,000)	(324,192,000)		$ (237,782,000)
Cumulative Effect Adjustment Upon Adoption
Accounting Policies [Line Items]
Cumulative effect on retained earnings			(364,000)
Cumulative Effect Adjustment Upon Adoption | Retained Earnings
Accounting Policies [Line Items]
Cumulative effect on retained earnings			$ (364,000)
ASU 2016-13 | Cumulative Effect Adjustment Upon Adoption, Before Tax | Retained Earnings
Accounting Policies [Line Items]
Cumulative effect on retained earnings				$ (459,000)
ASU 2016-13 | Cumulative Effect Adjustment Upon Adoption, Tax | Retained Earnings
Accounting Policies [Line Items]
Cumulative effect on retained earnings				95,000
ASU 2016-13 | Cumulative Effect Adjustment Upon Adoption | Retained Earnings
Accounting Policies [Line Items]
Cumulative effect on retained earnings				$ (364,000)
Minimum
Accounting Policies [Line Items]
Installment Period	3 years
Minimum | Office Equipment and Furniture and Fixtures
Assets and Liabilities, Lessee [Abstract]
Useful lives	3 years
Maximum
Accounting Policies [Line Items]
Installment Period	4 years
Maximum | Office Equipment and Furniture and Fixtures
Assets and Liabilities, Lessee [Abstract]
Useful lives	7 years